Add new help command describe-keymap

* lisp/help-fns.el (describe-keymap): New command to show key bindings
for a given keymap.  (Bug#30660)
* doc/emacs/help.texi (Misc Help): Document the new command.
* doc/lispref/keymaps.texi (Scanning Keymaps): Add a cross-reference
to the above documentation.
* etc/NEWS: Announce the new command.

* test/lisp/help-fns-tests.el (help-fns-test-describe-keymap/symbol)
(help-fns-test-describe-keymap/value)
(help-fns-test-describe-keymap/not-keymap)
(help-fns-test-describe-keymap/let-bound)
(help-fns-test-describe-keymap/dynamically-bound-no-file): New tests.

Co-authored-by: Drew Adams <drew.adams@oracle.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/doc/lispref/keymaps.texi b/doc/lispref/keymaps.texi
index 259efea3248..4d513132e9f 100644
--- a/doc/lispref/keymaps.texi
+++ b/doc/lispref/keymaps.texi
@@ -1846,8 +1846,11 @@ local map.
 @cindex scanning keymaps
 @cindex keymaps, scanning
 
-  This section describes functions used to scan all the current keymaps
-for the sake of printing help information.
+  This section describes functions used to scan all the current
+keymaps for the sake of printing help information.  To display the
+bindings in a particular keymap, you can use the
+@code{describe-keymap} command (@pxref{Misc Help, , Other Help
+Commands, emacs, The GNU Emacs Manual})
 
 @defun accessible-keymaps keymap &optional prefix
 This function returns a list of all the keymaps that can be reached (via